3

Blueberry waffles:
If not the above, then you are probably referring to a slang term that describes a std (waffle sometimes refers to the vagina and the bluish color is from an infection). Are you ust curious or if a problem see your doctor.
...Read more

4

Internet prank:
This supposed dread sexually transmitted disease was simply made up. The fact that people believe in it and become afraid of it is a testament to the confusion and fear that internet fabrications can generate. It's much less funny when sites encourage people to self-diagnose other mythical problems and then pay for pricey, worthless book / remedies. I'm glad you saw through it.
...Read more

6

Possible condition:
Oral literature doesn't describe a condition with such name.
Nevertheless, the tongue can show bluish or reddish in different types of diseases. In an adult like you, it could be inflammation of the blood vessels on ventral area of tongue (varicosities) due to lose of elasticity of blood vessels, showing blue through the mucosa due to venous blood irrigation.
...Read more

8

Late height growth:
I have not experienced this in my practice. When you stop growing the bone does not continue to grow and certainly not 13 years later.
There are conditions where certain parts of your bone structure grow but you don't get taller.
That condition is acromegaly.
Please see your doctor about this.
...Read more